/**
 * Created by ztt on 2017/11/12.
 */
//引入 events模块
var events=require('events');
//创建 eventEmitter对象
var eventEmitter=new events.EventEmitter();
//创建event处理程序
var connectHandler=function  connected() {
    console.log('连接成功。');
    //触发data_received事件
    eventEmitter.emit('data_received');
}
//绑定connection事件处理程序
eventEmitter.on('connection',connectHandler);
//使用匿名函数绑定 data_received事件
eventEmitter.on('data_received',function () {
    console.log('数据接收成功！');
})
//触发connection事件
eventEmitter.emit('connection');
console.log('程序执行完毕。')